One marble costs $
a. One marker costs $(
a + 15). One colouring book costs $5
a.
- Harry bought 7 marbles, 3 markers and 1 colouring book. How much did he spend? Simplify your answer in terms of a.
- If a = 18, how much did Harry spend altogether?
(a)
Cost of 7 marbles = 7 x
a = $7
a Cost of 3 markers = 3 x (
a + 15) = $(3
a + 45)
Cost of 1 colouring book = $5
a Total amount that he spent
= 7
a + 3
a + 45 + 5
a= 7
a + 3
a + 5
a + 45
= $(15
a + 45)
(b)
If
a = 18,
total amount that he spent
= 15
a + 45
= (15 x 18) + 45
= 270 + 45
= $315
Answer(s): (a) $(15
a + 45) or $(45 + 15
a); (b) $315